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Quick Answer. It takes 9 to 10 hours to cook a 3-pound beef top round roast in a Crock-Pot at the low setting. The roast only requires about 5 hours of cooking time at the high setting, but this tough cut of meat isn't recommended for cooking on the high setting. The faster cook time and higher temperature doesn't break down the tough meat fibers and leaves the roast tough.
1 Season roast well with salt and pepper and sear in a hot pan until all sides are golden brown. 2  Place roast in a roasting pan with broth and cover with foil. 3  Or you can use and dutch oven with a lid. 4  Bake at 275 degrees until fully cooked. 5  For a 3 pound roast it takes about 3 hours, a 4 pound roast about 4 hours.